Surface mounted light fixture and heat dissipating structure for same

ABSTRACT

A light fixture includes a heat dissipating structure, an electronics assembly, and a bolt for attaching the heat dissipating structure to an external panel. The heat dissipating structure includes a first side having multiple outwardly extending projection regions and a socket, for receiving a light source, is formed in an apex of each projection region. A second side of the heat dissipating structure includes a heat sink formed in an internal cavity of each projection region. The heat sink includes fins in contact with and radially arranged about an outer surface of the socket. The electronics assembly is located at the first side of the heat dissipating structure. The bolt includes a passage through which wiring from an external source is routed to the electronics assembly. The electronics assembly includes wires routed through channels in each of the projection regions that electrically interconnect the light sources to the electronics assembly.

TECHNICAL FIELD OF THE INVENTION

The present invention relates generally to light fixtures. Morespecifically, the present invention relates to a light fixture for alight emitting diode (LED) light source having effective heatdissipation capability.

BACKGROUND OF THE INVENTION

Solid state lighting, such as light-emitting diodes (LEDs), offers aviable alternative to traditional light sources such as fluorescent,high intensity discharge (HID), and incandescent lamps. Indeed, lightfixtures (technically referred to as luminaires in accordance withInternational Electrotechnical Commission terminology) employing LEDsare fast emerging as a superior alternative to conventional lightfixtures because of their high energy conversion and optical efficiency,robustness, lower operating costs, and so forth.

However, a significant concern in the design and operation of LED-basedlight fixtures is that of thermal management. Implementation of LEDs formany light fixture applications has been hindered by the amount of heatbuild-up within the electronic circuits of the LEDs. This, heat build-upreduces LED light output, shortens lifespan, and can eventually causethe LEDs to fail. Consequently, effective heat dissipation is animportant design consideration for maintaining light output and/orincreasing lifespan for the light source.

BRIEF DESCRIPTION OF THE DRAWINGS

A more complete understanding of the present invention may be derived byreferring to the detailed description and claims when considered inconnection with the Figures, wherein like reference numbers refer tosimilar items throughout the Figures, and:

FIG. 1 shows a top view of a surface mounted light fixture in accordancewith an embodiment;

FIG. 2 shows a side view of the surface mounted light fixture;

FIG. 3 shows a front perspective view of a heat dissipating structurefor the surface mounted light fixture of FIG. 1;

FIG. 4 shows a front view of the heat dissipating structure;

FIG. 5 shows a back perspective view of the heat dissipating structurefor the surface mounted light fixture;

FIG. 6 shows a back view of the heat dissipating structure;

FIG. 7 shows a side sectional view of the heat dissipating structurealong sections lines 7-7 of FIG. 6;

FIG. 8 shows a back perspective view of the heat dissipating structureemphasizing an X-brace configuration of the heat dissipating structure;

FIG. 9 shows an exploded perspective view of a mounting detail for thesurface mounted light fixture of FIG. 1;

FIG. 10 shows a partial sectional side view of the mounting detail forthe surface mounted light fixture;

FIG. 11 shows a partial side view of a lens assembly for the surfacemounted light fixture;

FIG. 12 shows a block diagram of a wiring configuration for multiplesurface mounted light fixtures; and

FIG. 13 shows a block diagram of another wiring configuration formultiple surface mounted light fixtures.

DETAILED DESCRIPTION

Embodiments of the invention entail a surface mounted light fixture anda heat dissipating structure for the light fixture. The light fixtureand heat dissipating structure are configured to accommodate multipleLED light sources. Light emitting diode (LED) lamps, i.e., LED lightsources, are particularly suitable for applications calling forlow-profile light fixtures due to their compact size. Additionally, thelow energy consumption, long operating life, and durability of LED lightsources make them advantageous in commercial applications in which asignificant number of light fixtures are required to appropriatelyilluminate a relatively large area.

The surface mounted configuration of the light fixture is especiallysuitable in, for example, commercial environments, where its low profiledecreases the possibility of damage by operational traffic within thecommercial space. The heat dissipating structure includes sockets eachof which is configured to receive one of the multiple LED light sources.The heat dissipating structure maintains low temperature at the sockets,i.e., the junction between the LED light source and the structure, byeffectively conducting heat generated by the LED light source away fromthe LED light source. Maintaining a low temperature at this junctionyields improvements in lamp energy efficiency and enhanced lifespan forthe LED light sources. Additionally, the configuration of the heatdissipating structure provides a rigid and moisture resistant designsuitable in adverse environments.

Referring to FIGS. 1 and 2, FIG. 1 shows a top view of a surface mountedlight fixture 20 in accordance with an embodiment, and FIG. 2 shows aside view of surface mounted light fixture 20. Surface mounted lightfixture 20 generally includes a heat dissipating structure 22, anelectronics assembly 24 (shown in ghost form in FIG. 1), and lensassemblies 26. Light fixture 20 further includes a bolt 28 (visible inFIG. 9) configured for attachment of heat dissipating structure 22 to anexternal panel (not shown), which will be discussed in further detail inconnection with FIGS. 9 and 10.

Heat dissipating structure 22 incneopludes a first side 30 and a secondside 32 opposing first side 30. In an mounting configuration of lightfixture 20, light fixture 20 is hung such that second side 32 residesagainst an external panel, ceiling surface, or the like. Thus, firstside 30 faces outwardly toward the underlying volume in which lightfixture 20 is installed.

First side 30 includes at least one projection region 34 extendingoutwardly from first side 30. A socket 36 is formed in an apex 38 ofeach projection region 34. Each socket 36 is configured to receive alight source 40. Light source 40 may be any suitable lamp or lightarray, such as an LED lamp. One each of lens assemblies 26 is coupled tofirst side 30 of heat dissipating structure 22 over each socket 36containing light source 40. Lens assemblies 26 protect light sources 40from environmental hazards, such as water damage. Additionally lensassemblies 26 function to appropriately distribute the light from eachlight source 40 (discussed below).

A junction box 42 is coupled to first side 28 of heat dissipatingstructure 22 at a central section 44 of structure 22. Thus, junction box42 is centrally located between adjacent projection regions 34. In anembodiment, heat dissipating structure 22 and junction box 42 may beformed as a monolithic casting (i.e., formed from a single piece ofmaterial) of a heat conducting metallic or non-metallic material. Inalternative embodiments, heat dissipating structure 22 and junction box42 may be two separately manufactured components that are bolted,welded, or otherwise coupled together during manufacturing.

In its centralized location between adjacent projection regions 32,junction box 42 functions to centralize power distribution and serves asa data receiving and transmitting hub for light fixture 20. Moreparticularly, electronics assembly 24 is housed in junction box 42, andelectronics assembly 24 is configured for electrically interconnectinglight sources 40 to an external power source (not shown). Junction box42 can additionally contain sensory and communications devices such asan occupancy sensor 46, motion sensor, photocell, and the like. In someembodiments, junction box 42 can additionally include one or moreopenings 47 extending through its side walls. These openings 47 will bediscussed in greater detail in connection with FIG. 13. A cover 48 isattached to junction box 42 to protect electronics assembly 24 and anyother components from environmental hazards, such as water damage.

The configuration of heat dissipating structure 22 and the use of lightsources 40 in the form of LED-based light sources yields a low profileconfiguration of light fixture 20 having a height 50 of, for example,less than two inches.

Referring now to FIGS. 3 and 4, FIG. 3 shows a front perspective view ofheat dissipating structure 22 for surface mounted light fixture 20 (FIG.1), and FIG. 4 shows a front view of heat dissipating structure 22. Inthe front views of FIGS. 3 and 4, first side 30 of heat dissipatingstructure 22 is visible. As mentioned previously, first side 30 facesoutwardly toward the underlying volume in which light fixture 20 isinstalled.

In an embodiment, heat dissipating structure 22 is defined, ordelineated, by four quadrants 52. Each of quadrants 52 meets at centralsection 44, and each of quadrants 52 includes one of projection regions34. Thus, heat dissipating structure 22 includes four projection regions34 in the illustrated embodiment. The base of each projection region 34is surrounded by a generally rectangular, and more particularly, square,frame section 54 (most clearly distinguishable in FIG. 4. A flangedouter frame 56 delineates an outer perimeter of heat dissipatingstructure 22.

As shown, each of projection regions 34 is a pyramid shaped regionhaving four generally triangular sides 58, each of sides 58 beingtruncated at apex 38 to accommodate one of sockets 36. In particular,apex 38 of each projection region 34 includes a substantially planarsurface 60 surrounding one of sockets 36. Planar surface 60 is orientedsubstantially perpendicular to an outwardly extending direction ofprojection region 34. This outwardly extending direction corresponds toheight 50 (FIG. 2) of light fixture 20 (FIG. 2). Planar surface 60includes apertures 62 extending through heat dissipating structure 22from second side 32 (FIG. 2) to first side 30. Apertures 62 serve asweep holes designed to allow moisture to drain from heat dissipatingstructure 22, as will be discussed in greater detail below.

As mentioned above, junction box 42 is coupled to first side 30 of heatdissipating structure 22 and is located at central section 44.Accordingly, each of projection regions 34 is immediately adjacent tojunction box 42. Junction box 42 may be integrally formed with heatdissipating structure 22 to form as a monolithic casting, or junctionbox 42 may be bolted, welded, or otherwise coupled to heat dissipatingstructure 22. As such, junction box 42 is illustrated in FIGS. 3 and 4using dashed lines to represent these at least two means for forming the“coupling” between junction box 42 and heat dissipating structure 22.

Junction box 42 includes a threaded opening 64 extending through a backwall 66 of junction box 42. Threaded opening 64 is adapted to receivebolt 28 (FIG. 9) for fastening heat dissipating structure 22 to anexternal panel and thus fasten light fixture 20 (FIG. 1) to the externalpanel, as will be discussed in connection with FIGS. 9 and 10.

Referring now to FIGS. 5-7, FIG. 5 shows a back perspective view of heatdissipating structure 22 for surface mounted light fixture 20 (FIG. 1).FIG. 6 shows a back view of heat dissipating structure 22, and FIG. 7shows a side sectional view of the heat dissipating structure alongsections lines 7-7 of FIG. 6. In the back views of FIGS. 5 and 6, secondside 32 of heat dissipating structure 22 is visible. As mentionedpreviously, second side 32 resides against an external panel, ceilingsurface, or the like.

Second side 32 includes a heat sink 66 formed in an internal cavity 68of each of projection regions 34. Heat sink 66 includes a plurality offins 70 residing in internal cavity 68. Each of fins 70 is in contactwith and radially arranged about an outer surface 72 of socket 36. Thatis, fins 70 are oriented in a starburst pattern surrounding outersurface 72 of socket 36.

As best represented in the side sectional view of FIG. 7, heatdissipating structure 22 exhibits height 50 between apex 38 and framesection 54. Due to the pyramid structure of each of projection regions34, a height 74 immediately proximate frame section 54 is significantlyless than height 50. The decreasing height from apex 38 to frame section54 results in a correspondingly decreasing height of internal cavity 68from apex 38 to outer frame 56.

A top edge 76 (see FIG. 5) of each of fins 70 is coupled with an innersurface 78 of projection region 34 and with outer frame 56.Consequently, each of fins 70 exhibits a variable fin height 80corresponding to height 50 at apex 38 and decreasing to height 74 at theouter perimeter of projection region 34 delineated by frame section 54.Additionally, a bottom edge 82 (see FIG. 5) of each of fins 70 residingin internal cavity 68 is approximately flush with outer frame 56 of heatdissipating structure 22 so that fins 70 do not project outside of outerframe 56.

Heat dissipating structure 22 further includes laterally orientedchannels 84 visible from second side 32. Each channel 84 has a first end86 opening into junction box 72 and a second end 88 opening into one ofsockets 36. In particular, each projection region 34 has one of channels84 extending between junction box 42 and its corresponding socket 36. Inan embodiment, each channel 84 is adapted to receive a wire (not shown)extending between electronics assembly 24 (FIG. 1) and socket 36 forelectrically interconnecting light source 40 (FIG. 1) to electronicsassembly 24. In an embodiment, during assembly of light fixture 20 (FIG.1), wires (not shown) may be routed from junction box 42 to each ofsockets 36 via channels 84. After the wires are residing in channels 84,channels 84 may be sealed using an industrial sealant or encapsulatingcompound, so that moisture cannot enter channels 84.

FIG. 8 shows a back perspective view of the heat dissipating structure22 emphasizing an X-brace configuration of heat dissipating structure22. In particular, a number of fins 70 are not illustrated so thatprimary fins 70 that provide enhanced rigidity to heat dissipatingstructure 22 can be clearly visualized.

It will be recalled that a generally rectangular frame section 54surrounds a base of each projection region 34, such that frame section54 delineates an outer perimeter of internal cavity 68. For each ofprojection regions 34, a first pair 90 of fins 70 extends from outersurface 72 of socket 36 to a first pair of diagonally opposed corners 92of frame section 54. Additionally, a second pair 94 of fins 70 extendsfrom outer surface 72 of socket 36 to a second pair of diagonallyopposed corners 96 of frame section 54. Thus, each of first and secondpairs 90 and 94, respectively, of fins 70 yields an X-braceconfiguration within each of projection regions 34 to impart structuralrigidity in each quadrant 52 of heat dissipating structure 22.

For purposes of explanation, each of quadrants 52 are successivelylabeled 52A, 52B, 52C, and 52D in FIG. 8. Thus, quadrant 52A is referredto herein as a first quadrant 52A, quadrant 52B is referred to herein asa second quadrant 52B, quadrant 52C is referred to herein as a thirdquadrant 52C, and quadrant 52D is referred to herein as a fourthquadrant 52B. First and third quadrants 52A and 52C are arranged indiagonally opposing relation relative to central section 44. Inaddition, second and fourth quadrants 52B and 52D are arranged indiagonally opposing relation relative to central section 44. Each ofprojection regions 34 are successively labeled 34A, 34B, 34C, and 34D inFIG. 8. Hence, projection region 34A is referred to herein as a firstprojection region 34A, projection region 34B is referred to herein as asecond projection region 34B, projection region 34C is referred toherein as a third projection region 34C, and projection region 34D isreferred to herein as a fourth projection region 34D.

In an embodiment, first pair 90 of fins 70 residing in internal cavity68 of first projection region 34A located in first quadrant 52A isserially aligned with first pair 90 of fins 70 residing in internalcavity 68 of third projection region 34C located in third quadrant 52C.Similarly, second pair 94 of fins 70 residing in internal cavity 68 ofsecond projection region 34B located in second quadrant 52B is seriallyaligned with second pair 94 of fins 70 residing in internal cavity 68 offourth projection region 34D located in fourth quadrant 52D. The term“serially aligned” refers to an arrangement of fins 70 in a straightline or row. Accordingly, first pair 90 of fins 70 in each of first andthird projection regions 34A and 34C are in a straight line or row, andsecond pair 94 of fins 70 in each of second and fourth projectionregions 34B and 34D are in a straight line or row. This configuration offins 850 extends the X-brace configuration diagonally across theentirety of heat dissipating structure 22 in order to further enhancethe structural rigidity of heat dissipating structure 22. Fins 70 areillustrated as being relatively thin at the junction between centralsection 44 and fins 70 for simplicity of illustration. However, inpractice, fins 70 may be thickened at the junction between centralsection 44 and fins 70 in order to withstand the stress applied by bolt28 (FIG. 9) following installation.

Referring to FIGS. 9 and 10, FIG. 9 shows an exploded perspective viewof a mounting detail for the surface mounted light fixture 20, and FIG.10 shows a partial sectional side view of the mounting detail forsurface mounted light fixture 20. In an embodiment, surface mountedlight fixture 20 is suitable for installation in a refrigeratedenvironment where the ambient temperature may not exceed 45° F. (7.2°C.). The refrigerated environment may be a refrigerated cooler, awalk-in refrigerated room, or the like configured to hold perishablefood products. This installation environment is not a requirementhowever. In alternative embodiments, light fixture 20 may be installedin an environment in which the ambient temperature is greater than orless than 45° F. (7.2° C.).

A refrigerated cooler or walk-in refrigerated room may occasionally besubjected to cleaning by, for example, pressure washing. Thus, such anenvironment light fixture 20 can be subjected to significant moisturefrom cleaning operations. Accordingly, light fixture 20 employs severalmoisture protection strategies that will be discussed in connection withits installation.

Light fixture 20 is installed on a ceiling panel 98, such as the ceilingof an insulated cooler box or a dropped ceiling of a refrigerated room.The term “dropped ceiling” refers to a secondary ceiling hung below themain (structural) ceiling, and the area above the dropped ceiling, i.e.,ceiling panel 98, is referred to as a plenum space 100.

Installation entails drilling a hole through ceiling panel 98 that iscompatible with the diameter of bolt 28. A gasketed plate 102 is placeddirectly over the hole. In an embodiment, plate 102 may have a gasket104 laminated to an underside of plate 102. Thus, once installed, gasket104 would reside between plate 102 and a top surface 106 of ceilingpanel 98. Gasketed plate 102 may further include another gasket 108placed on and/or adhered to a top side of plate 102. Next, aconventional junction box 110 is placed on top of gasket 108. A neoprenewasher 112 can be inserted onto bolt 28. Bolt 28 is inserted throughjunction box 110, through plate 102, and through ceiling panel 98.

Light fixture 20 is placed against a bottom surface 114 of ceiling panel98 with a gasket 116 (visible in FIG. 10) interposed between ceilingpanel and second side 32 of light fixture 20. Bolt 28 is rotated untilsome resistance is felt. That is, bolt 28 is rotated into threadedengagement with threaded opening 64 extending through junction box 42 oflight fixture 20.

Referring briefly to FIG. 3, heat dissipating structure 22 may includefour holes 118 extending through structure 22. Now with reference backto FIGS. 9 and 10, installation continues by fastening four sheet metalalignment screws 120 (two visible in FIG. 10) into ceiling panel 98 viaholes 118 after aligning light fixture 20 in its final position. Bolt 28and alignment screws 120 are fully tightened. After bolt 28 is fullytightened, a cover 122 may be coupled to junction box 110 to sealjunction box 110 from moisture.

It should be noted that alignment screws 120 are relatively short sothat they do not extend fully through ceiling panel 98. Accordingly,only a single hole is made through ceiling panel 98, thereby creatingonly one breach in ceiling panel 98 per light fixture 20. As bolt 28 istightened, compression stress is applied to the X-brace configuration offins 70 (FIG. 8). This compression stress transfers to fins 70 which actas tributaries for the compression stress. In this manner, the appliedpressure is uniformly distributed around flanged outer frame 56 of heatdissipating structure 22, i.e., the perimeter of light fixture 20 (FIG.1), resulting in a tight seal.

In an embodiment, bolt 28 may be fabricated from a thermallynon-conductive material, such as a composite of plastic or graphite, orbolt 28 may be fabricated from a non-corrosive metal that is coated witha thermally non-conductive material. Bolt 28 includes a longitudinallyaligned interior passage 124 for directing wiring 126 from an externalpower source (not shown) to electronics assembly 24 housed in junctionbox 42. Wiring 126 may include power and control wires for light sources40 (FIG. 1) and any other electronics, such as occupancy sensor 46 (FIG.1). Wiring 126 is sealed in passage 124 and is thus sealed from air andmoisture travel. In the absence of moist air (or liquid) penetratingfrom above ceiling panel 98, and by utilizing a thermally non-conductivebolt 28, “sweating,” i.e., condensation build-up, cannot occur.

FIG. 11 shows a partial side view of one of lens assemblies 26 forsurface mounted light fixture 20. Inside of the refrigerated space,gasket 116 protects against water entering the backside, i.e., secondside 32, of heat dissipating structure 22 if and/or when light fixture20 is cleaned by, for example, pressure washing. However, in the eventthat water does penetrate around gasket 116, apertures 62 in planarsurface 60 of projection regions 34 located around sockets 36 functionas weep holes thus allowing the water to drain by gravity flow.

Lens assembly 26 includes a lens 128 coupled to a surrounding lens frame130. Installation of lens assembly 26 to heat dissipating structure 22overlying socket 36 entails placement of a gasket 132 interposed betweenlens frame 130 and planar surface 60 of projection region 34 surroundingsocket 36. Lens frame 130 may then be attached to heat dissipatingstructure 22 by, for example, non-corrosive screws (not shown). Lensassembly 26 with the intervening gasket 132 effectively seals socket 36from water. Additionally, lens frame 130 extends partially overapertures 62 so that apertures 62 are not exposed to a direct spray ofwater. However, a remaining channel 134 around lens frame 130 stillallows for the drainage of water from apertures 62.

Lens 128 may be a simple glass and/or plastic material flat lens.Alternatively, lens 128 may be a specialized lens having the capabilityof refracting light above a horizon line in order to avoid a “caveeffect” lighting scenario. The optics of lens 128 may be variablyconstructed in order to achieve a particular lighting pattern. In anembodiment, a variable construct of lens 128 may include a generallyhemispherical portion 136 surrounded by a series of concentric rings 138with substantially identical, sharply peaked, symmetrical cross sections140. Concentric rings 138 are, in turn, surrounded by an outerconcentric ring 142 with a substantially flat surface 144.

Although each feature of construction of lens 128 contributes to thelight output over most output angles, each feature is used primarily tocontrol the light output over a narrow range. For example, hemisphericalportion 136 primarily contributes light output in a range from normal(zero degrees) to about forty degrees. Concentric rings 138 primarilycontribute light output in a range from approximately forty degrees toapproximately ninety degrees, and outer ring 142 with flat surface 144primarily contributes light output in a range from approximately ninetydegrees to one hundred and twenty degrees.

A magnitude of the effect of each type of construction of lens 128 canbe controlled by the relative surface area taken up by thatconstruction. An optimization process may be used to achieve the overalldesired angular output. In an optimization process, for example, primaryvariables can be the relative areas of each type of construction (i.e.,hemispherical portion 136, peaked concentric rings 138, and outer ring142 with flat surface 144), and/or the apex (included) angle for seriesof sharply peaked rings 138. The construction of lens 128 can enable therefraction of light above a horizon line, i.e., greater than ninetydegrees, in order to avoid a “cave effect” lighting scenario. However,those skilled in the art will recognize that lens 128 may havealternative construction configurations then that which was disclosed.

In operation, light sources 40 generate heat when illuminated. Heatgenerally travels from hot to cooler regions. By virtue of theirplacement in sockets 36 of heat dissipating structure 22, light sources40 are sunk into a thermal mass, i.e. heat sink 66. Heat generated bylight sources 40 travels by conduction through the starburstconfiguration of fins 70 (FIG. 5). Fins 70 convey the heat to the outerskin of projection regions 34, i.e., to first side 30 of heatdissipating structure 22. Thus, fins 70 can efficiently remove heat froma junction 146 between light sources 40 and heat sink 66 to first side30 of heat dissipating structure 22. An additional contributor tolowering the temperature at junction 146 is ceiling panel 98 onto whichlight fixture 20 is mounted. Heat trapped between fins 70 and ceilingpanel 98 may be absorbed by the thermally conductive skin or surface ofceiling panel 98, and is conducted into the cooled environment.

FIG. 12 shows a block diagram of a wiring configuration 148 for multiplesurface mounted light fixtures 20. In some configurations, there may bea need for multiple light fixtures 20 in order to sufficiently light arefrigerated environment 150. In the illustrated wiring configuration148, a separate power supply 152 is electrically connected with twolight fixtures 20. Power supplies 152 are placed outside of and aboverefrigerated environment 150 in plenum space 100. Light fixtures 20 areelectrically connected to power supplies 152 via wiring that is alsolocated outside of and above refrigerated environment 150 in plenumspace 100.

Thus, power supplies 152 are external to light fixtures 20 so that anyheat produced by power supplies 152 does not compromise the lifespan oflight sources 40 (FIG. 1). Additionally, power supplies 152 are externalto refrigerated environment 150 so that any heat produced by powersupplies 152 is not conducted through light fixture 20 and intorefrigerated environment 150. Power supplies 152 may supply power tolight sources 40, occupancy sensor(s) 46 (FIG. 1), photocell(s), andother devices that may be used in refrigerated environment 150. Powersupplies 152 may be in communication with local or remote controls, andmay operate by line voltage, low voltage, or a combination thereof. Abackup power supply (not shown), such as a battery, may be used tooperate light fixtures 20 where emergency illumination is required.

FIG. 13 shows a block diagram of another wiring configuration 154 for asystem of surface mounted light fixtures 20. In the illustrated wiringconfiguration 154, a separate power supply 152 is electrically connectedwith two light fixtures 20. Like wiring configuration 148 (FIG. 12),power supplies 152 are placed outside of and above refrigeratedenvironment 150 in plenum space 100 so that any heat produced by powersupplies 152 does not adversely affect the lifespan of light sources 40and/or so that any heat produced by power supplies 152 is not conductedinto refrigerated environment 150. However, pairs of light fixtures 20are electrically connected to one another in a serial arrangement via awiring conduit 156. Thus, only one of light fixtures 20 from each pairof light fixtures 20 is directly connected to one of power supplies 152.

As discussed previously in connection with FIG. 2, in some embodiments,junction box 42 (FIG. 2) may include openings 47 (see FIGS. 2-3)extending through one or more of its side walls. These openings 47 canbe utilized to direct wiring and moisture resistant conduit, referred toherein as wiring conduit 156, between junction boxes 42 of adjacentlight fixtures 20. For example, one end of a wiring conduit 156 may becoupled at an opening 47 (shown in FIGS. 2-3) in junction box 42 of oneof light fixtures 20, and an opposing end of wiring conduit 156 may becoupled at another opening 47 in another junction box 42 in an adjacentlight fixtures 20. Any unused openings 47 in junction box 42 may besealed using, for example, plugs (not shown) in order to maintain themoisture resistance of light fixtures 20. As such, electricalinterconnection is provided between electronic assemblies (FIG. 1) oflight fixtures 20 via wiring conduit 156 located inside of refrigeratedenvironment 150. Although two wiring configurations 148 (FIG. 12) and154 are shown, those skilled in the art will recognize that that asystem of multiple light fixtures 20 sufficient to light refrigeratedenvironment 150 can be coupled with an external power source in amultitude of configurations.

In summary, embodiments entail a surface mounted light fixture and aheat dissipating structure for the light fixture. The heat dissipatingstructure includes projection regions surrounding a centrally locatedjunction box. A socket is formed at an apex of each projection region,and each socket is configured to receive an LED light source. Thejunction box provides a housing for power and control to the multiplelight sources and additional electrical components, such as an occupancysensor. In addition, openings in the junction box allow for theprovision power and control within an environment to other lightfixtures in a system configuration. A heat sink is formed in an internalcavity of each projection region. The heat sink includes fins arrangedin a starburst pattern around each of the sockets so as to form anX-brace configuration. The combination of the X-brace configuration offins and the junction box yields a rigid, low profile light fixture,capable of uniform and efficient heat extraction and dissipation.Additionally, the X-brace configuration, junction box, inclusion ofgaskets, and mounting methodology produces a tight and uniform seal to aceiling panel, with a single hole extending through the ceiling panel,so as to largely prevent water entry into the light fixture.Furthermore, the isolated and protected power wire way system through aninternal passage in the bolt and into the junction box, as well as thechannels extending between the junction box and each socket, provideseffective routing for electrical power from an external power source tothe light sources and further protects critical electrical componentsfrom moisture. A rigid, moisture resistant, low profile structurecapable of effectively conducting heat away from the LED light sourceyields improvements in lamp energy efficiency, enhanced lifespan for theLED light sources, and can be readily implemented in commercial venues,such as refrigerated coolers, clean rooms, hazardous environments, andso forth.

Although the preferred embodiments of the invention have beenillustrated and described in detail, it will be readily apparent tothose skilled in the art that various modifications may be made thereinwithout departing from the spirit of the invention or from the scope ofthe appended claims. For example, the design of light fixture may bescaled up or down to accommodate different light source outputs.

What is claimed is:
 1. A device comprising: an elongated body having alongitudinally aligned interior passage adapted for directing wiringfrom a first location to a second location; a fastening structure formedat a first end of said elongated body, said fastening structure beingadapted for attachment to a removable device, said interior passageextending through said fastening structure in order to deliver saidwiring to said removable device; and a gasket coupled at least one endof said elongated body wherein said fastening structure compresses saidgasket forming a seal from air travel and moisture travel between thefirst location and the second location, wherein said elongated body isformed from a non-corrosive material, said non-corrosive material beingcoated with or made of a thermally non-conductive material.
 2. A systemcomprising: a light fixture including: a heat dissipating structurehaving a first side and a second side opposing said first side, saidfirst side including at least one projection region extending outwardlyforming an apex and a recessed surface formed in said apex, saidrecessed surface configured to retain a light source and located betweensaid apex and said second side, and a plurality of fins adjacent to saidrecessed surface, wherein the fins extend from said apex of saidprojection region past the recessed surface toward the second side,wherein the second side is flat and the fins terminate at the secondside; an electronics assembly located at said first side of said heatdissipating structure; and a fastener device configured for attachmentof said heat dissipating structure to an external panel, said fastenerdevice including a longitudinally aligned interior passage for directingwiring from an external power source to said electronics assembly. 3.The system as claimed in claim 2 wherein said light fixture furthercomprises a junction enclosure coupled to said first side of said heatdissipating structure, said electronics assembly is housed in saidjunction enclosure, and said junction enclosure includes a threadedopening, said fastener device being configured to couple to saidjunction enclosure via said threaded opening.
 4. The system as claimedin claim 3 wherein said heat dissipating structure and said junctionenclosure are formed as a monolithic casting of heat conductingmaterial.
 5. The system as claimed in claim 3 wherein said light fixtureis a first light fixture, said junction enclosure is a first junctionenclosure, said threaded opening is a first threaded opening, and saidsystem further comprises: a second light fixture, said second lightfixture including a second heat dissipating structure having said firstside and said second side, a second junction enclosure coupled to saidfirst side of said second heat dissipating structure, and a secondelectronics assembly housed in said second junction enclosure, whereinsaid second junction enclosure includes a second threaded opening; and awiring conduit having a first end coupled to said first junctionenclosure at said first threaded opening and having a second end coupledto said second junction enclosure at said second threaded opening forelectrically interconnecting said first and second electronicsassemblies.
 6. The system as claimed in claim 2 further comprising aplate configured for placement at a first surface of said externalpanel, and said fastener device is adapted to pass through an opening ineach of said plate and said external panel to fasten said heatdissipating structure against a second surface of said external panel.7. The system as claimed in claim 2 wherein: said heat dissipatingstructure includes a channel extending through said heat dissipatingstructure between a location of said electronics assembly and saidrecessed surface; and said electronics assembly includes at least onewire residing in said passage for electrically interconnecting saidlight source to said electronics assembly.
 8. The system as claimed inclaim 2 wherein said light fixture further includes: a lens assemblycoupled to said first side of said heat dissipating structure overlyingsaid recessed surface; and a gasket interposed between a frame of saidlens assembly and a planar surface of said projection region surroundingsaid recessed surface.
 9. The system as claimed in claim 8 wherein: saidplanar surface includes apertures extending through said heatdissipating structure; and said lens assembly includes a lens frame thatextends partially over said apertures.
 10. A device comprising: anelongated body having an interior passage adapted for directing wiringfrom a first location to a second location; and a fastening structureformed at said first end of said body, said fastening structure beingadapted for attachment to a removable device, said interior passageextending through said fastening structure in order to deliver saidwiring to said removable device, wherein said elongated body is formedfrom a non-corrosive material, said non-corrosive material being coatedwith or made of a thermally non-conductive material.
 11. A method formounting a light fixture to an external panel comprising: placing agasket and pressure plate structure at a first side of said externalpanel over a panel opening formed through said external panel, saidgasket and pressure plate structure having a plate opening aligned withsaid panel opening; placing a junction enclosure over said gasket andpressure plate structure at said first side of said external panel, saidjunction enclosure having a enclosure opening aligned with each of saidpanel opening and said plate opening; inserting a fastener devicethrough said enclosure opening, said plate opening, and said panelopening, said fastener device being non-corrosive and thermallynon-conductive; and compressively attaching said fastener device withsaid light fixture, wherein said light fixture is located at a secondside of said external panel, wherein said compressively attachingimposes a compressive force between said light fixture and said gasketand pressure plate structure to retain said light fixture in a sealedengagement with said external panel.
 12. The method of claim 11 furthercomprising positioning a gasket between said second side of saidexternal panel and a back side of said light fixture.
 13. The method ofclaim 11 wherein a longitudinally aligned interior passage extendsthrough an entirety of said fastener device, and said method furthercomprises: directing wiring through said interior passage from a powersource external to said junction enclosure to an electronics assemblyhoused in said light fixture; and sealing said interior passage againstmoisture and air passage.
 14. The method of claim 11 wherein saidcompressively attaching comprises rotating said fastener device intothreaded engagement with a threaded opening extending through said lightfixture, wherein said rotating imposes a compressive force between saidlight fixture and said gasket and pressure plate structure.
 15. Themethod of claim 11, wherein said gasket and pressure plate structure andsaid junction enclosure are formed as a monolithic structure, whereinsaid enclosure opening and said plate opening are the same opening. 16.A lighting device comprising: an elongated body having a longitudinallyaligned interior passage adapted for directing wiring from a firstlocation to a second location; and a fastening structure formed in saidelongated body, said fastening structure being adapted for attachment toa removable device having a heat dissipating structure, said interiorpassage extending through said fastening structure in order to deliversaid wiring to said removable device, wherein said elongated body isformed from a non-corrosive material, said non-corrosive material beingcoated with or made of a thermally non-conductive material; and saidheat dissipating structure comprising a first side and a second sideopposing said first side, said first side including a projection regionextending outwardly forming an apex and a recessed surface formed insaid apex, said recessed surface releasably retaining a light source onsaid recessed surface, said recessed surface located between said apexand said second side, wherein said wiring is connected to said lightsource, said heat dissipating structure comprising a plurality of finsadjacent to said recessed surface, wherein the fins extend from the apexof said projection region past the recessed surface of the projectionregion and toward the second side, wherein the second side is flat andthe fins terminate at the second side.
 17. The lighting device of claim16, further comprising a gasket and pressure plate structure, whereinsaid gasket and pressure plate structure comprises a plate opening tocouple to said elongated body, and wherein an external panel iscompressed between said gasket and pressure plate structure.
 18. Thelighting device of claim 17, further comprising a gasket coupled to saidsecond side of said heat dissipating structure, wherein said gasketforms a seal form air and moisture between said second side of said heatdissipating structure and said external panel in response to compressionof said external panel between said gasket and pressure plate structureand said second side of said heat dissipating structure.
 19. Thelighting device of claim 17, wherein said gasket and pressure platestructure uniformly distributes forces across a plate area of saidgasket and pressure plate structure in response to compressing saidexternal panel between said gasket and pressure plate structure.
 20. Thelighting device of claim 19, further comprising a junction enclosure,wherein said junction enclosure is one of coupled to said gasket andpressure plate structure or formed as a monolithic structure with saidgasket and pressure plate structure.
 21. The lighting device of claim16, wherein said heat dissipating structure is a monolithic structure.22. The system of claim 2 wherein said longitudinally aligned interiorpassage is formed from a non-corrosive material, said non-corrosivematerial being coated with or made of a thermally non-conductivematerial.
 23. The lighting device of claim 16 wherein said elongatedbody is formed from a non-corrosive material, said non-corrosivematerial being coated with or made of a thermally non-conductivematerial.